//
////public class Person{
////
////    private String name = "Person";
////
////    int age=0;
////
////}
////
////public class Child extends Person{
////
////    public String grade;
////
////}
//class Base {
//    Base() {
//        System.out.print("Base");
//    }
//}
//
//public class Alpha extends Base {
//
//    public static void main( String[] args ) {
//        new Alpha();//1
//        //调用父类无参的构造方法
//        new Base();//2
//    }
//}
//
//
//public class test_23_3_24 {
//
////    public static void main(String[] args){
////
////        Person p = new Child();
////
////        System.out.println(p.name);
////
////    }
//}
